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Unread 08-10-2014, 08:38 PM   #1
Masaga91
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2009 KK Liberty 
 
Join Date: Mar 2011
Location: santa ana, costa rica
Posts: 99
3rd brake light problem

my 3rd brake light works when ever it wants to, the light is fine, i've seen it on, but most of the time when i press the pedal it won't work, have anyone else have this problem??? any ideas of how can it be fixed ??

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Unread 08-10-2014, 10:40 PM   #2
AtTheHelm
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I'd start by removing it and inspecting and cleaning the connections. Use a multimeter or 12v circuit tester to see if power is getting to the light.
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Unread 08-16-2014, 11:10 AM   #3
Masaga91
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I cleaned the connectors and it didn't worked, and used a tester and i'm getting no power to the 3rd brake light
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Unread 08-16-2014, 02:34 PM   #4
RENE65
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2008 KK Liberty 
 
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Location: LAVAL, QUEBEC
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From what I see in my Haynes manual ( shows wiring but does not specefy for what year or all years ) the power for the brakes light comes from the brake switch and the goes to the 3 brake lights with a white/tan wire. I have no indications as where the splits are in the harness.Often the problems in wiring are corrosion or broken wires where they flex.An easy check would be to open the tail gate, go to the flex hose where the wiring goes through , see if you can find a white /tan wire and check for a break there. DO NOT PUNCH HOLES IN THE WIRES WITH A TEST LIGHT. Any needle hole in the wiring will cause moisture to enter the wires and cause a break in a short time.You can pull a bit on the wire to see if it has some stretch,if it does it clearly indicates a break in the wire. The next place to check would be to check for previous repairs or modifications such as trailor harness installation.If they did needle holes in the wiring to check for power,the wire will break there .Let us know how it goes
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Unread 08-20-2014, 10:29 AM   #5
Masaga91
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So I checked the wires and found out that the 3rd brake light has to cables, a white/green and a black/blue, I took the picture where in the white cable there's this yellow spot on the cable, could that be corrosion??
The other thing I noticed is that the black/blue cable doesn't come with the cables that come in the flex hose, is just there in the 3d brake light, is that normal??
wp_20140820_09_57_31_pro.jpg  
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Unread 08-20-2014, 03:45 PM   #6
RENE65
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Corrosion in wires is usually green. Its not clear to me what you are explaning about the black wire.
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Unread 08-21-2014, 10:35 AM   #7
Masaga91
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Quote:
Originally Posted by RENE65 View Post
Corrosion in wires is usually green. Its not clear to me what you are explaning about the black wire.
That the black cable is connected to the connector of the light and then enters that hole to connect to big bunch of cables, but when I took out the flex hose I realized that the black cable is not there
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Unread 08-21-2014, 12:08 PM   #8
RENE65
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Possibly grounded to the body somewhere around there.The black cable is usually the ground and since you said that you had no 12v at the light, the black wire is probably not your problem.Do you have a Hitch wiring on your Jeep ? If yes, is it factory ?
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Unread 08-21-2014, 03:46 PM   #9
Masaga91
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Quote:
Originally Posted by RENE65 View Post
Possibly grounded to the body somewhere around there.The black cable is usually the ground and since you said that you had no 12v at the light, the black wire is probably not your problem.Do you have a Hitch wiring on your Jeep ? If yes, is it factory ?
No hitch in my jeep
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Unread 08-22-2014, 03:06 AM   #10
josworth
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2010 KK Liberty 
 
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Quote:
Originally Posted by RENE65 View Post
Possibly grounded to the body somewhere around there.The black cable is usually the ground and since you said that you had no 12v at the light, the black wire is probably not your problem.Do you have a Hitch wiring on your Jeep ? If yes, is it factory ?
Yea, many times individual components have their own ground vs using a common ground in the harness.

Easy check is to look for continuity by hooking your tester up to the ground at the connector then seeing if you get continuity to the body. If you can't get a circuit then trace the ground wire......

Just a tip since Rene65 is correct that without 12v showing on the power side, a ground issue is highly unlikely.
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